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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd38ef22c081b5ad75b4b90810c387d97fa5cc708e8a4d73faf8e5ceee87440d' 
  AND token = 'AShni/8EtenJiyySLJVPz3Q82YGuLr9ntk06f866fkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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