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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f73c2bf47de874c9404fc07822538d82a9851e640b752fcb360888cff11bf6' 
  AND token = 'fnoitgoz1O+1QVOe3pPx9ckwqX1cB0bWps409gSGB/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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