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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e8b8ffe7d826956bd7edd7a0138e60b292e62527bd736be9a11c23b509b261' 
  AND token = 'abPJq/UdlUo2mcy3Guorf6uzjFcbTtSDd+irbDUxQ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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