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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35e10a5d8282176baf4551f49d69919c8d1965f2785dae24e058802ad775db9' 
  AND token = 'eX1Y6XjWZKKfHl9QFLy2ZZTfF/kfmlsJwD8DDAaHuBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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