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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c289fa986667e34134927316c489a1e366e02dc4eea5b7f8e7ee3996dd3dfbf' 
  AND token = 'l4RT4M8Wodm7+9XNysUfMZgi4JJNSMutAgcao8dzPig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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