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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96231ad04a428501b6666ac6945b4826a34ee1461f3c77c1b012471a811a34fd' 
  AND token = 'EgGF20GNaErPhjcw4T20qcvR75zURM0LEuusU3l5AFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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