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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19814e4df8482b40ed6e39f6cd59d271b0c339a9b0198684bbc3b0bd418cddc6' 
  AND token = 'NGehbdJAYRM6UdS2tN0MBZdLsMGJJKujHTGurxt1qe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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