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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7770ee5a12b2f2872bcebf73f4dde04ea5e963d98522b3651c075319260636' 
  AND token = 'zSZBDMRgPjKtvoY7fLC1w90uM16XhfpZkMyeM4uWjy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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