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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7200604b8a3176042df5254ca247960aa8d9c138703069f4e4d98de3b370050d' 
  AND token = 'Ts2vTbwMDiQ34q2o+O9CFg2WeEignmlD9bzU6ZdXako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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