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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3dcfe32f0ced7630a00d8eb61d8b81b4ab9302412134e26e253713e730a1b7' 
  AND token = 'acwfyZk9A0LmhyoDIkSU7zaP7urd4Wf9hnemfB0W5CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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