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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197aee96bca4beffb1b4874b01a7ecca66cd4149bd9cc4a73efa87c3e6a43482' 
  AND token = 'J/LOUmb4rNs8PJ4KUEaxSLPUSyY5sum76rMwmrApLPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}