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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e4d0414ee5bf3b1a75404b17888d5480a4b9cd8fd0becd3732bf41c9edfbfa' 
  AND token = 'paC99d5PE1/D7yoncfgjRKrTnkbsIKVNwkhtH/jz5ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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