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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccd36ae9b1a4c7dd40783e46c524f41416dad5bcb415c9b67dcc4e305dd0096' 
  AND token = '1xjFVLXSMPU46wWYrdZtK8XEGZ8N66G6F1BW+3A1o1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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