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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d109a7a4599ab1d1129665071c00d1f8f0910fdcdfbe491a4d523cbeba4ba2a' 
  AND token = 'vAEXjfGe6oS7WO31K9oNjkoGB3laZlCOJ+/s6CPeg8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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