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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f89e15d8e9bab48fc8263be4e3efec7fd2d86fba8cbc27e894e6a95ebdf18' 
  AND token = 'ZcCBsNUy0sqTgc5YVbl+7xRJxkpNB1W8qMzqp28nRbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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