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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9ba35b00ca2f7676cb0a09e71d981a2678ff283ecec5e1e9be6fa3dfd4ea17' 
  AND token = 'Max9YNuKo4n9O9M6WgtA7pTHO6gv6xKw2qmGqcgqlLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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