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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9182bfcff50d8df602ebc2cbb9bac6f8ba883ffed2e918f2fc7e907f902c6ab3' 
  AND token = '2Abatnl8/rDb6hJMTjaMQP9HScCu9yRsM9DixT02WVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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