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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35e10ddddd3072300ae1150628608e7862a10a1722aa8e45d1bbc6253888308' 
  AND token = 'R1dnmtUOPqa4aRyhaRAV7zQ9usjlZHLZYVUs/e9UI64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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