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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6558558e01797d873e092881338de4c68d789ef134d107c5a023023dee80cd' 
  AND token = 'wdpxdjwYmc2Ht4ErHo0GYOJ+voqLMG6ol7L/Es6quUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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