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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae24d195ad44b01ace0634d39d2d5ff201bab58542d790963032589c3328b67' 
  AND token = '12vBBIpQOc686eoxUYh2mcgeatBCzCkwDyvZ+C/3N0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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