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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0319579b4ce60377c66fd8782527faf5b7a85f95b43d6a6773a5bdabfab12913' 
  AND token = 'W4nYzo2yl9bug4N9lOMtSf3m7JelKjuZ2TmWv/FS3Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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