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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb966b499bd3c373ac26c270e0aabab0dabe74c3b3513c4c036f6a753bf8c31c' 
  AND token = 'FhIyFXaFacrq8/374KIJ6RuNqsmexvsNTuEYtyKryCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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