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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ba2e6adb5f9987e32830c0e2db783c47719bb5ed40ed397b92a34b3cdc3576' 
  AND token = 'pxuuUWz4segOGai0OF0xrpHyHH6pZCpYuOamvuju7Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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