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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7441baeb7748c92efc4861f22fd90b29dc11ae6cb2a0615571ee573b652967' 
  AND token = 'URFIwa/feSEbIzFB5g7JmP0uPV3F8OsT5uTRBIStjPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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