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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c06431983e5d8c05687a3db7a3a4c63c9932243d3bcfc9a581b361ec3f99b40' 
  AND token = 'hChzkB7yqcT7j06a3QDKmUNMXz5AoWuNkHk5HmMatA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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