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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62a268fc1d285ce0efd9f3fe19b07788b3f1e9ec4616929f9028f079ca8efb8' 
  AND token = '/W/TqwfqiU0Eunagf26d7SNwHQnRNZqKk8mPg6pap9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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