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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73b7d0a7ce6f8768059dc4b00db9f33ebe7d5edefec11f1c331c6a9239fe7c0' 
  AND token = 'zxdx384lsdMic07qOvoWb9D2VtE7SAr4nUaaKNSh4R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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