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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82d367a9b602374be18ef9889b7db6bba925582a8a69e81b868386946ed41e8' 
  AND token = '8HtwH+helvWNX4qmsQjdxo1KbcSzY0O3sF57AIdz4LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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