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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53cc7230600a8ec638558335273812afdaa2bb636b8001d910ba404cc5e9f26' 
  AND token = 'wZINY2i5fcsZgYCUMSsR7pticLGR09Ne4DQXfRSayXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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