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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb55a6e7ff700e340457da0fd59f884b9a007f2e698edb873d1c16d1bed3ba56' 
  AND token = 'nvstGpAiOSXD5ZyICR/3CAbf2EI35qczSKds0fc9Sqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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