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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a1240dba638111d1eb36c7d9e4e939888dbe51842afdab81ff711a28b394c1' 
  AND token = 'tMyLItYpyIhzB+97ekdaXrBLSQ8RSHmjVelM+v2/2os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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