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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b6e7ff8e714a7f92794db32fbf4d860820d5af099d2065a043cba65d0616cf' 
  AND token = 'C+EJdigCgk0EhpNgaIWcasLrr+ZsArKsUPlmBTdHsQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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