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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dbb0ed8ca90d21b81323fc7a592231578db938808440985e492ae94c925766' 
  AND token = 'vyP0C2iuLBIWItnghDpwhlN4369BrB7zB/pbGfB3FbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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