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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f929dc5f130a836635abb37843aff64240e3ed7b88a8bf11504de3c1b765772e' 
  AND token = 'OiaG9joXKV9l56or/vuB/lS2VetQeTDvc0MZRQRxqO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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