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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ebda24be2cab9fd00eb4d5d66d5b568ff63e61e3857b54aa1b6fc9ed1a9843' 
  AND token = 'nTLf72/xd1ML3MNmAOEpAXmnSz2dpDK/Pd7u/sbvK0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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