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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1649b3b60ef217e1a8ad01286b98a01edde65a9b6912344ab2dfc1e203186555' 
  AND token = 'Pgwxfx5bbGiHOLCCLdG8gGly2dlIOSNcUFRLiII0Xew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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