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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3443e174e3f4496dee6433da3c97b7618cf13a135574326bb2a04372b80831' 
  AND token = '359TAWNlCp6e7HFx+jpInlMdSh+VT34rTx79/ce0+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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