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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f357e8b80445cdbdcfe56044321c9fe7b3d50b833d26e1d428a0bbac97b3b4' 
  AND token = 'dFIUTj+GXal/kVwLsHdch8B3q2re67paGOoqLY4krHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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