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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6002b6aaa0078c6cfbfa2ef170d376e4c5c832be57e104a8342e230465a977c' 
  AND token = 'FhBEmWxQYL0Mlzy6RCeCaiBOZyK+q/4565ZER9XBFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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