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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02262e91edd7771dba87230a1c533a4e208851f60e36f210de2da6ebbe67a57b' 
  AND token = 'puKCOWT32+IbTdxa1RhpR/5eyf9dXBos/yrocL08MCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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