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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f49bfbb51a1ac743996db001cdfc1d26c93b23088c924083ab3b8882a854d5' 
  AND token = 'VEniUKfe1Z98twRl6RXFYiFtE0uD9Y4qSt9MD+phLIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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