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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac1a3b01359ba1e931dca92bc734a3c48d7f7a291ce7be37c5a25a8dc8cfdbc' 
  AND token = 'gTgOj1FdWQJf4u99hfmJ3lRoqBXr0Bns+SjnWe8HYFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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