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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702be3a2ddfafab79c14eb85cb14e39846dedf36ff59023fb116e27c97f70e29' 
  AND token = 'qkVIpKZGdS0EVldYkfX3IXFj3HjLgLwZAu7Xtw1T7rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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