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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc01ad03801e26202cfed2047be80bb8805519cc6e11a402716cc8a7e6e39afa' 
  AND token = 'LnaboSJHuMAdzWv6nEW9QK044vfQxAHfvHcGqCgHaj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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