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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b048687bf894670cbae140eb15358af2e05d79b970f876ba4070554692c6e' 
  AND token = 'LUEQx0lvu6tD3YxGpc4JFGI4mR9C89sw/sPitQ+YXHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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