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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eb6db69a3d1e59d626cf1de54fb575693f5e81cae2fd829b39fef41ff7f1ef' 
  AND token = 'k80s8dAoEL9MB06F5sDWElIZdSwJwrtKoojPaclGWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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