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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e975b0a9e7f4e3785d77c458a96db1697ab9a0d6ee2c9c6b044e49a9c0b99e2b' 
  AND token = 'JnysZ+E9esfDRY0DP8ZD89MAo188vjUqP7M7vbwf/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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