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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7872f588362159bfa8882548dcc35d1da9d316e56d33b0918787fd2bcd05684b' 
  AND token = 'HTcJjy6pktQ1vLxte7zLBa2q/8QUY2nteauU1zpE7rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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