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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea5152caddcebecbe02da583bd7da263a002bc70ff27e470273ae02f885c9c9' 
  AND token = 'MOLbVkyv/uBHqpQKB3+cmZU+sICUx8w76d2Ng1gOf04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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