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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5731925def4ce7d747fd471866f9497b0f38186e74e70071bc973eecd425039b' 
  AND token = '8j+mHtFT7n72PD46vdpC8hwoqDIFbi5KvV4Rs/gcVOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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