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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48f026edf05012394598ada663d1a60bf03e30eb8aee4a81a98b278af4e7cad' 
  AND token = 'WVz8H1aeRBanUSqkjfrLZVKx7cQO26Y6aY23qVn6YNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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