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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79918a2b196594b6214e182fa764556d7dd9a918ce34463c271d2a3821000c5d' 
  AND token = '9yCXUKY3wffCaU3G97u0YHZyb1leyU3dj6cm5Imssws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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