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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b7c861cbdb1d86446dc1a1d3ca011bc532df49a244a6fc1adbaf5a52e42729' 
  AND token = '0JebvD4KSDglvyDSPX3MmJJmsLv4CzijW99HtjXsX28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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