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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cc75990f9e7ddd3bb9b6a27c39f53eb16333682e43fed34d57e6174f4fb717' 
  AND token = 'Cmc0m8HipIqbQC96M/fRGHZvX9jaTuX5NeebA9nDZPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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