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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b0af8238196ff70cd67e9131182e538851924faf07c16b9804bd2410ab4683' 
  AND token = 'NjG7rHUMcXOP88awq4+eI1+vjg/9jgWXEu6tKfg16Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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