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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a124e78ea0f3de5a252d31caa59c59dc183dadce9207f693a434eae8f61716fc' 
  AND token = 'pt4q1FX9rGF6KzESQeBYidswQQIBQ6zBg9neDwV0pRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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