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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60325a2a1821bcddf8fce5c687e71087cc6eb5a94d0bdb4580588a7b87187c7c' 
  AND token = 'Ry8kvX+cOH69bi2gG6cdsm1M1mtGOHR/uT+fby7ij78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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