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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493c465e5ad14e0f7e494313001546d24aec5628d413628174e461c78bccdf02' 
  AND token = '/6yZuw398XIyEJ9HihfsYv6k6Sjhg9aSct/ZqxazkoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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