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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f339da106c27b1b77fb0d10c01132a9f481c7135aa7c5c8428039648385d6ff' 
  AND token = 'Yo0EETphR5n3W54uWdoqxVcB3cQ7iTNzdXiVgVQpSME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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