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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85032f002983de0aca302f003e4b6ae15a9f8457fc566bc0fdcfcda191c025b3' 
  AND token = '7N+bSaMjI6vLtXDeWO65mXpybFjH7cXo0c25EZ+z3pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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