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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06f72a98ddec88d89adcff87461ede5421e4736ae4ba851b095ee2c81261742' 
  AND token = 'TsrOgI43Gig4a1PDkfjG/SwA6bspSxVDI6shqVJTWh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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